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sdio.c
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1 /*
2  * linux/drivers/mmc/sdio.c
3  *
4  * Copyright 2006-2007 Pierre Ossman
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or (at
9  * your option) any later version.
10  */
11 
12 #include <linux/err.h>
13 #include <linux/pm_runtime.h>
14 
15 #include <linux/mmc/host.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/mmc.h>
18 #include <linux/mmc/sdio.h>
19 #include <linux/mmc/sdio_func.h>
20 #include <linux/mmc/sdio_ids.h>
21 
22 #include "core.h"
23 #include "bus.h"
24 #include "sd.h"
25 #include "sdio_bus.h"
26 #include "mmc_ops.h"
27 #include "sd_ops.h"
28 #include "sdio_ops.h"
29 #include "sdio_cis.h"
30 
31 static int sdio_read_fbr(struct sdio_func *func)
32 {
33  int ret;
34  unsigned char data;
35 
36  if (mmc_card_nonstd_func_interface(func->card)) {
37  func->class = SDIO_CLASS_NONE;
38  return 0;
39  }
40 
41  ret = mmc_io_rw_direct(func->card, 0, 0,
42  SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
43  if (ret)
44  goto out;
45 
46  data &= 0x0f;
47 
48  if (data == 0x0f) {
49  ret = mmc_io_rw_direct(func->card, 0, 0,
50  SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
51  if (ret)
52  goto out;
53  }
54 
55  func->class = data;
56 
57 out:
58  return ret;
59 }
60 
61 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
62 {
63  int ret;
64  struct sdio_func *func;
65 
66  BUG_ON(fn > SDIO_MAX_FUNCS);
67 
68  func = sdio_alloc_func(card);
69  if (IS_ERR(func))
70  return PTR_ERR(func);
71 
72  func->num = fn;
73 
74  if (!(card->quirks & MMC_QUIRK_NONSTD_SDIO)) {
75  ret = sdio_read_fbr(func);
76  if (ret)
77  goto fail;
78 
79  ret = sdio_read_func_cis(func);
80  if (ret)
81  goto fail;
82  } else {
83  func->vendor = func->card->cis.vendor;
84  func->device = func->card->cis.device;
85  func->max_blksize = func->card->cis.blksize;
86  }
87 
88  card->sdio_func[fn - 1] = func;
89 
90  return 0;
91 
92 fail:
93  /*
94  * It is okay to remove the function here even though we hold
95  * the host lock as we haven't registered the device yet.
96  */
97  sdio_remove_func(func);
98  return ret;
99 }
100 
101 static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
102 {
103  int ret;
104  int cccr_vsn;
105  int uhs = ocr & R4_18V_PRESENT;
106  unsigned char data;
107  unsigned char speed;
108 
109  memset(&card->cccr, 0, sizeof(struct sdio_cccr));
110 
111  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
112  if (ret)
113  goto out;
114 
115  cccr_vsn = data & 0x0f;
116 
117  if (cccr_vsn > SDIO_CCCR_REV_3_00) {
118  pr_err("%s: unrecognised CCCR structure version %d\n",
119  mmc_hostname(card->host), cccr_vsn);
120  return -EINVAL;
121  }
122 
123  card->cccr.sdio_vsn = (data & 0xf0) >> 4;
124 
125  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
126  if (ret)
127  goto out;
128 
129  if (data & SDIO_CCCR_CAP_SMB)
130  card->cccr.multi_block = 1;
131  if (data & SDIO_CCCR_CAP_LSC)
132  card->cccr.low_speed = 1;
133  if (data & SDIO_CCCR_CAP_4BLS)
134  card->cccr.wide_bus = 1;
135 
136  if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
137  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
138  if (ret)
139  goto out;
140 
141  if (data & SDIO_POWER_SMPC)
142  card->cccr.high_power = 1;
143  }
144 
145  if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
146  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
147  if (ret)
148  goto out;
149 
150  card->scr.sda_spec3 = 0;
151  card->sw_caps.sd3_bus_mode = 0;
152  card->sw_caps.sd3_drv_type = 0;
153  if (cccr_vsn >= SDIO_CCCR_REV_3_00 && uhs) {
154  card->scr.sda_spec3 = 1;
155  ret = mmc_io_rw_direct(card, 0, 0,
156  SDIO_CCCR_UHS, 0, &data);
157  if (ret)
158  goto out;
159 
160  if (card->host->caps &
164  if (data & SDIO_UHS_DDR50)
165  card->sw_caps.sd3_bus_mode
167 
168  if (data & SDIO_UHS_SDR50)
169  card->sw_caps.sd3_bus_mode
171 
172  if (data & SDIO_UHS_SDR104)
173  card->sw_caps.sd3_bus_mode
175  }
176 
177  ret = mmc_io_rw_direct(card, 0, 0,
178  SDIO_CCCR_DRIVE_STRENGTH, 0, &data);
179  if (ret)
180  goto out;
181 
182  if (data & SDIO_DRIVE_SDTA)
183  card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_A;
184  if (data & SDIO_DRIVE_SDTC)
185  card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
186  if (data & SDIO_DRIVE_SDTD)
187  card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
188  }
189 
190  /* if no uhs mode ensure we check for high speed */
191  if (!card->sw_caps.sd3_bus_mode) {
192  if (speed & SDIO_SPEED_SHS) {
193  card->cccr.high_speed = 1;
194  card->sw_caps.hs_max_dtr = 50000000;
195  } else {
196  card->cccr.high_speed = 0;
197  card->sw_caps.hs_max_dtr = 25000000;
198  }
199  }
200  }
201 
202 out:
203  return ret;
204 }
205 
206 static int sdio_enable_wide(struct mmc_card *card)
207 {
208  int ret;
209  u8 ctrl;
210 
211  if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
212  return 0;
213 
214  if (card->cccr.low_speed && !card->cccr.wide_bus)
215  return 0;
216 
217  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
218  if (ret)
219  return ret;
220 
222  pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
223  mmc_hostname(card->host), ctrl);
224 
225  /* set as 4-bit bus width */
226  ctrl &= ~SDIO_BUS_WIDTH_MASK;
227  ctrl |= SDIO_BUS_WIDTH_4BIT;
228 
229  ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
230  if (ret)
231  return ret;
232 
233  return 1;
234 }
235 
236 /*
237  * If desired, disconnect the pull-up resistor on CD/DAT[3] (pin 1)
238  * of the card. This may be required on certain setups of boards,
239  * controllers and embedded sdio device which do not need the card's
240  * pull-up. As a result, card detection is disabled and power is saved.
241  */
242 static int sdio_disable_cd(struct mmc_card *card)
243 {
244  int ret;
245  u8 ctrl;
246 
247  if (!mmc_card_disable_cd(card))
248  return 0;
249 
250  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
251  if (ret)
252  return ret;
253 
254  ctrl |= SDIO_BUS_CD_DISABLE;
255 
256  return mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
257 }
258 
259 /*
260  * Devices that remain active during a system suspend are
261  * put back into 1-bit mode.
262  */
263 static int sdio_disable_wide(struct mmc_card *card)
264 {
265  int ret;
266  u8 ctrl;
267 
268  if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
269  return 0;
270 
271  if (card->cccr.low_speed && !card->cccr.wide_bus)
272  return 0;
273 
274  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
275  if (ret)
276  return ret;
277 
278  if (!(ctrl & SDIO_BUS_WIDTH_4BIT))
279  return 0;
280 
281  ctrl &= ~SDIO_BUS_WIDTH_4BIT;
282  ctrl |= SDIO_BUS_ASYNC_INT;
283 
284  ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
285  if (ret)
286  return ret;
287 
289 
290  return 0;
291 }
292 
293 
294 static int sdio_enable_4bit_bus(struct mmc_card *card)
295 {
296  int err;
297 
298  if (card->type == MMC_TYPE_SDIO)
299  return sdio_enable_wide(card);
300 
301  if ((card->host->caps & MMC_CAP_4_BIT_DATA) &&
302  (card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
304  if (err)
305  return err;
306  } else
307  return 0;
308 
309  err = sdio_enable_wide(card);
310  if (err <= 0)
312 
313  return err;
314 }
315 
316 
317 /*
318  * Test if the card supports high-speed mode and, if so, switch to it.
319  */
320 static int mmc_sdio_switch_hs(struct mmc_card *card, int enable)
321 {
322  int ret;
323  u8 speed;
324 
325  if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
326  return 0;
327 
328  if (!card->cccr.high_speed)
329  return 0;
330 
331  ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
332  if (ret)
333  return ret;
334 
335  if (enable)
336  speed |= SDIO_SPEED_EHS;
337  else
338  speed &= ~SDIO_SPEED_EHS;
339 
340  ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
341  if (ret)
342  return ret;
343 
344  return 1;
345 }
346 
347 /*
348  * Enable SDIO/combo card's high-speed mode. Return 0/1 if [not]supported.
349  */
350 static int sdio_enable_hs(struct mmc_card *card)
351 {
352  int ret;
353 
354  ret = mmc_sdio_switch_hs(card, true);
355  if (ret <= 0 || card->type == MMC_TYPE_SDIO)
356  return ret;
357 
358  ret = mmc_sd_switch_hs(card);
359  if (ret <= 0)
360  mmc_sdio_switch_hs(card, false);
361 
362  return ret;
363 }
364 
365 static unsigned mmc_sdio_get_max_clock(struct mmc_card *card)
366 {
367  unsigned max_dtr;
368 
369  if (mmc_card_highspeed(card)) {
370  /*
371  * The SDIO specification doesn't mention how
372  * the CIS transfer speed register relates to
373  * high-speed, but it seems that 50 MHz is
374  * mandatory.
375  */
376  max_dtr = 50000000;
377  } else {
378  max_dtr = card->cis.max_dtr;
379  }
380 
381  if (card->type == MMC_TYPE_SD_COMBO)
382  max_dtr = min(max_dtr, mmc_sd_get_max_clock(card));
383 
384  return max_dtr;
385 }
386 
387 static unsigned char host_drive_to_sdio_drive(int host_strength)
388 {
389  switch (host_strength) {
391  return SDIO_DTSx_SET_TYPE_A;
393  return SDIO_DTSx_SET_TYPE_B;
395  return SDIO_DTSx_SET_TYPE_C;
397  return SDIO_DTSx_SET_TYPE_D;
398  default:
399  return SDIO_DTSx_SET_TYPE_B;
400  }
401 }
402 
403 static void sdio_select_driver_type(struct mmc_card *card)
404 {
405  int host_drv_type = SD_DRIVER_TYPE_B;
406  int card_drv_type = SD_DRIVER_TYPE_B;
407  int drive_strength;
408  unsigned char card_strength;
409  int err;
410 
411  /*
412  * If the host doesn't support any of the Driver Types A,C or D,
413  * or there is no board specific handler then default Driver
414  * Type B is used.
415  */
416  if (!(card->host->caps &
420  return;
421 
422  if (!card->host->ops->select_drive_strength)
423  return;
424 
425  if (card->host->caps & MMC_CAP_DRIVER_TYPE_A)
426  host_drv_type |= SD_DRIVER_TYPE_A;
427 
428  if (card->host->caps & MMC_CAP_DRIVER_TYPE_C)
429  host_drv_type |= SD_DRIVER_TYPE_C;
430 
431  if (card->host->caps & MMC_CAP_DRIVER_TYPE_D)
432  host_drv_type |= SD_DRIVER_TYPE_D;
433 
434  if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_A)
435  card_drv_type |= SD_DRIVER_TYPE_A;
436 
437  if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_C)
438  card_drv_type |= SD_DRIVER_TYPE_C;
439 
440  if (card->sw_caps.sd3_drv_type & SD_DRIVER_TYPE_D)
441  card_drv_type |= SD_DRIVER_TYPE_D;
442 
443  /*
444  * The drive strength that the hardware can support
445  * depends on the board design. Pass the appropriate
446  * information and let the hardware specific code
447  * return what is possible given the options
448  */
449  drive_strength = card->host->ops->select_drive_strength(
450  card->sw_caps.uhs_max_dtr,
451  host_drv_type, card_drv_type);
452 
453  /* if error just use default for drive strength B */
454  err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_DRIVE_STRENGTH, 0,
455  &card_strength);
456  if (err)
457  return;
458 
459  card_strength &= ~(SDIO_DRIVE_DTSx_MASK<<SDIO_DRIVE_DTSx_SHIFT);
460  card_strength |= host_drive_to_sdio_drive(drive_strength);
461 
462  err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_DRIVE_STRENGTH,
463  card_strength, NULL);
464 
465  /* if error default to drive strength B */
466  if (!err)
467  mmc_set_driver_type(card->host, drive_strength);
468 }
469 
470 
471 static int sdio_set_bus_speed_mode(struct mmc_card *card)
472 {
473  unsigned int bus_speed, timing;
474  int err;
475  unsigned char speed;
476 
477  /*
478  * If the host doesn't support any of the UHS-I modes, fallback on
479  * default speed.
480  */
481  if (!(card->host->caps & (MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 |
483  return 0;
484 
485  bus_speed = SDIO_SPEED_SDR12;
486  timing = MMC_TIMING_UHS_SDR12;
487  if ((card->host->caps & MMC_CAP_UHS_SDR104) &&
488  (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR104)) {
489  bus_speed = SDIO_SPEED_SDR104;
490  timing = MMC_TIMING_UHS_SDR104;
491  card->sw_caps.uhs_max_dtr = UHS_SDR104_MAX_DTR;
492  } else if ((card->host->caps & MMC_CAP_UHS_DDR50) &&
493  (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_DDR50)) {
494  bus_speed = SDIO_SPEED_DDR50;
495  timing = MMC_TIMING_UHS_DDR50;
496  card->sw_caps.uhs_max_dtr = UHS_DDR50_MAX_DTR;
497  } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
498  MMC_CAP_UHS_SDR50)) && (card->sw_caps.sd3_bus_mode &
500  bus_speed = SDIO_SPEED_SDR50;
501  timing = MMC_TIMING_UHS_SDR50;
502  card->sw_caps.uhs_max_dtr = UHS_SDR50_MAX_DTR;
503  } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
505  (card->sw_caps.sd3_bus_mode & SD_MODE_UHS_SDR25)) {
506  bus_speed = SDIO_SPEED_SDR25;
507  timing = MMC_TIMING_UHS_SDR25;
508  card->sw_caps.uhs_max_dtr = UHS_SDR25_MAX_DTR;
509  } else if ((card->host->caps & (MMC_CAP_UHS_SDR104 |
511  MMC_CAP_UHS_SDR12)) && (card->sw_caps.sd3_bus_mode &
513  bus_speed = SDIO_SPEED_SDR12;
514  timing = MMC_TIMING_UHS_SDR12;
515  card->sw_caps.uhs_max_dtr = UHS_SDR12_MAX_DTR;
516  }
517 
518  err = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
519  if (err)
520  return err;
521 
522  speed &= ~SDIO_SPEED_BSS_MASK;
523  speed |= bus_speed;
524  err = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
525  if (err)
526  return err;
527 
528  if (bus_speed) {
529  mmc_set_timing(card->host, timing);
530  mmc_set_clock(card->host, card->sw_caps.uhs_max_dtr);
531  }
532 
533  return 0;
534 }
535 
536 /*
537  * UHS-I specific initialization procedure
538  */
539 static int mmc_sdio_init_uhs_card(struct mmc_card *card)
540 {
541  int err;
542 
543  if (!card->scr.sda_spec3)
544  return 0;
545 
546  /*
547  * Switch to wider bus (if supported).
548  */
549  if (card->host->caps & MMC_CAP_4_BIT_DATA) {
550  err = sdio_enable_4bit_bus(card);
551  if (err > 0) {
553  err = 0;
554  }
555  }
556 
557  /* Set the driver strength for the card */
558  sdio_select_driver_type(card);
559 
560  /* Set bus speed mode of the card */
561  err = sdio_set_bus_speed_mode(card);
562  if (err)
563  goto out;
564 
565  /* Initialize and start re-tuning timer */
566  if (!mmc_host_is_spi(card->host) && card->host->ops->execute_tuning)
567  err = card->host->ops->execute_tuning(card->host,
569 
570 out:
571 
572  return err;
573 }
574 
575 /*
576  * Handle the detection and initialisation of a card.
577  *
578  * In the case of a resume, "oldcard" will contain the card
579  * we're trying to reinitialise.
580  */
581 static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
582  struct mmc_card *oldcard, int powered_resume)
583 {
584  struct mmc_card *card;
585  int err;
586 
587  BUG_ON(!host);
588  WARN_ON(!host->claimed);
589 
590  /*
591  * Inform the card of the voltage
592  */
593  if (!powered_resume) {
594  err = mmc_send_io_op_cond(host, host->ocr, &ocr);
595  if (err)
596  goto err;
597  }
598 
599  /*
600  * For SPI, enable CRC as appropriate.
601  */
602  if (mmc_host_is_spi(host)) {
603  err = mmc_spi_set_crc(host, use_spi_crc);
604  if (err)
605  goto err;
606  }
607 
608  /*
609  * Allocate card structure.
610  */
611  card = mmc_alloc_card(host, NULL);
612  if (IS_ERR(card)) {
613  err = PTR_ERR(card);
614  goto err;
615  }
616 
617  if ((ocr & R4_MEMORY_PRESENT) &&
618  mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid, NULL) == 0) {
619  card->type = MMC_TYPE_SD_COMBO;
620 
621  if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
622  memcmp(card->raw_cid, oldcard->raw_cid, sizeof(card->raw_cid)) != 0)) {
623  mmc_remove_card(card);
624  return -ENOENT;
625  }
626  } else {
627  card->type = MMC_TYPE_SDIO;
628 
629  if (oldcard && oldcard->type != MMC_TYPE_SDIO) {
630  mmc_remove_card(card);
631  return -ENOENT;
632  }
633  }
634 
635  /*
636  * Call the optional HC's init_card function to handle quirks.
637  */
638  if (host->ops->init_card)
639  host->ops->init_card(host, card);
640 
641  /*
642  * If the host and card support UHS-I mode request the card
643  * to switch to 1.8V signaling level. No 1.8v signalling if
644  * UHS mode is not enabled to maintain compatibility and some
645  * systems that claim 1.8v signalling in fact do not support
646  * it.
647  */
648  if ((ocr & R4_18V_PRESENT) &&
649  (host->caps &
652  MMC_CAP_UHS_DDR50))) {
654  true);
655  if (err) {
656  ocr &= ~R4_18V_PRESENT;
657  host->ocr &= ~R4_18V_PRESENT;
658  }
659  err = 0;
660  } else {
661  ocr &= ~R4_18V_PRESENT;
662  host->ocr &= ~R4_18V_PRESENT;
663  }
664 
665  /*
666  * For native busses: set card RCA and quit open drain mode.
667  */
668  if (!powered_resume && !mmc_host_is_spi(host)) {
669  err = mmc_send_relative_addr(host, &card->rca);
670  if (err)
671  goto remove;
672 
673  /*
674  * Update oldcard with the new RCA received from the SDIO
675  * device -- we're doing this so that it's updated in the
676  * "card" struct when oldcard overwrites that later.
677  */
678  if (oldcard)
679  oldcard->rca = card->rca;
680  }
681 
682  /*
683  * Read CSD, before selecting the card
684  */
685  if (!oldcard && card->type == MMC_TYPE_SD_COMBO) {
686  err = mmc_sd_get_csd(host, card);
687  if (err)
688  return err;
689 
690  mmc_decode_cid(card);
691  }
692 
693  /*
694  * Select card, as all following commands rely on that.
695  */
696  if (!powered_resume && !mmc_host_is_spi(host)) {
697  err = mmc_select_card(card);
698  if (err)
699  goto remove;
700  }
701 
702  if (card->quirks & MMC_QUIRK_NONSTD_SDIO) {
703  /*
704  * This is non-standard SDIO device, meaning it doesn't
705  * have any CIA (Common I/O area) registers present.
706  * It's host's responsibility to fill cccr and cis
707  * structures in init_card().
708  */
709  mmc_set_clock(host, card->cis.max_dtr);
710 
711  if (card->cccr.high_speed) {
714  }
715 
716  goto finish;
717  }
718 
719  /*
720  * Read the common registers.
721  */
722  err = sdio_read_cccr(card, ocr);
723  if (err)
724  goto remove;
725 
726  /*
727  * Read the common CIS tuples.
728  */
729  err = sdio_read_common_cis(card);
730  if (err)
731  goto remove;
732 
733  if (oldcard) {
734  int same = (card->cis.vendor == oldcard->cis.vendor &&
735  card->cis.device == oldcard->cis.device);
736  mmc_remove_card(card);
737  if (!same)
738  return -ENOENT;
739 
740  card = oldcard;
741  }
742  mmc_fixup_device(card, NULL);
743 
744  if (card->type == MMC_TYPE_SD_COMBO) {
745  err = mmc_sd_setup_card(host, card, oldcard != NULL);
746  /* handle as SDIO-only card if memory init failed */
747  if (err) {
748  mmc_go_idle(host);
749  if (mmc_host_is_spi(host))
750  /* should not fail, as it worked previously */
752  card->type = MMC_TYPE_SDIO;
753  } else
754  card->dev.type = &sd_type;
755  }
756 
757  /*
758  * If needed, disconnect card detection pull-up resistor.
759  */
760  err = sdio_disable_cd(card);
761  if (err)
762  goto remove;
763 
764  /* Initialization sequence for UHS-I cards */
765  /* Only if card supports 1.8v and UHS signaling */
766  if ((ocr & R4_18V_PRESENT) && card->sw_caps.sd3_bus_mode) {
767  err = mmc_sdio_init_uhs_card(card);
768  if (err)
769  goto remove;
770 
771  /* Card is an ultra-high-speed card */
772  mmc_card_set_uhs(card);
773  } else {
774  /*
775  * Switch to high-speed (if supported).
776  */
777  err = sdio_enable_hs(card);
778  if (err > 0)
779  mmc_sd_go_highspeed(card);
780  else if (err)
781  goto remove;
782 
783  /*
784  * Change to the card's maximum speed.
785  */
786  mmc_set_clock(host, mmc_sdio_get_max_clock(card));
787 
788  /*
789  * Switch to wider bus (if supported).
790  */
791  err = sdio_enable_4bit_bus(card);
792  if (err > 0)
794  else if (err)
795  goto remove;
796  }
797 finish:
798  if (!oldcard)
799  host->card = card;
800  return 0;
801 
802 remove:
803  if (!oldcard)
804  mmc_remove_card(card);
805 
806 err:
807  return err;
808 }
809 
810 /*
811  * Host is being removed. Free up the current card.
812  */
813 static void mmc_sdio_remove(struct mmc_host *host)
814 {
815  int i;
816 
817  BUG_ON(!host);
818  BUG_ON(!host->card);
819 
820  for (i = 0;i < host->card->sdio_funcs;i++) {
821  if (host->card->sdio_func[i]) {
822  sdio_remove_func(host->card->sdio_func[i]);
823  host->card->sdio_func[i] = NULL;
824  }
825  }
826 
827  mmc_remove_card(host->card);
828  host->card = NULL;
829 }
830 
831 /*
832  * Card detection - card is alive.
833  */
834 static int mmc_sdio_alive(struct mmc_host *host)
835 {
836  return mmc_select_card(host->card);
837 }
838 
839 /*
840  * Card detection callback from host.
841  */
842 static void mmc_sdio_detect(struct mmc_host *host)
843 {
844  int err;
845 
846  BUG_ON(!host);
847  BUG_ON(!host->card);
848 
849  /* Make sure card is powered before detecting it */
850  if (host->caps & MMC_CAP_POWER_OFF_CARD) {
851  err = pm_runtime_get_sync(&host->card->dev);
852  if (err < 0)
853  goto out;
854  }
855 
856  mmc_claim_host(host);
857 
858  /*
859  * Just check if our card has been removed.
860  */
861  err = _mmc_detect_card_removed(host);
862 
863  mmc_release_host(host);
864 
865  /*
866  * Tell PM core it's OK to power off the card now.
867  *
868  * The _sync variant is used in order to ensure that the card
869  * is left powered off in case an error occurred, and the card
870  * is going to be removed.
871  *
872  * Since there is no specific reason to believe a new user
873  * is about to show up at this point, the _sync variant is
874  * desirable anyway.
875  */
876  if (host->caps & MMC_CAP_POWER_OFF_CARD)
877  pm_runtime_put_sync(&host->card->dev);
878 
879 out:
880  if (err) {
881  mmc_sdio_remove(host);
882 
883  mmc_claim_host(host);
884  mmc_detach_bus(host);
885  mmc_power_off(host);
886  mmc_release_host(host);
887  }
888 }
889 
890 /*
891  * SDIO suspend. We need to suspend all functions separately.
892  * Therefore all registered functions must have drivers with suspend
893  * and resume methods. Failing that we simply remove the whole card.
894  */
895 static int mmc_sdio_suspend(struct mmc_host *host)
896 {
897  int i, err = 0;
898 
899  for (i = 0; i < host->card->sdio_funcs; i++) {
900  struct sdio_func *func = host->card->sdio_func[i];
901  if (func && sdio_func_present(func) && func->dev.driver) {
902  const struct dev_pm_ops *pmops = func->dev.driver->pm;
903  if (!pmops || !pmops->suspend || !pmops->resume) {
904  /* force removal of entire card in that case */
905  err = -ENOSYS;
906  } else
907  err = pmops->suspend(&func->dev);
908  if (err)
909  break;
910  }
911  }
912  while (err && --i >= 0) {
913  struct sdio_func *func = host->card->sdio_func[i];
914  if (func && sdio_func_present(func) && func->dev.driver) {
915  const struct dev_pm_ops *pmops = func->dev.driver->pm;
916  pmops->resume(&func->dev);
917  }
918  }
919 
920  if (!err && mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
921  mmc_claim_host(host);
922  sdio_disable_wide(host->card);
923  mmc_release_host(host);
924  }
925 
926  return err;
927 }
928 
929 static int mmc_sdio_resume(struct mmc_host *host)
930 {
931  int i, err = 0;
932 
933  BUG_ON(!host);
934  BUG_ON(!host->card);
935 
936  /* Basic card reinitialization. */
937  mmc_claim_host(host);
938 
939  /* No need to reinitialize powered-resumed nonremovable cards */
940  if (mmc_card_is_removable(host) || !mmc_card_keep_power(host))
941  err = mmc_sdio_init_card(host, host->ocr, host->card,
942  mmc_card_keep_power(host));
943  else if (mmc_card_keep_power(host) && mmc_card_wake_sdio_irq(host)) {
944  /* We may have switched to 1-bit mode during suspend */
945  err = sdio_enable_4bit_bus(host->card);
946  if (err > 0) {
948  err = 0;
949  }
950  }
951 
952  if (!err && host->sdio_irqs)
954  mmc_release_host(host);
955 
956  /*
957  * If the card looked to be the same as before suspending, then
958  * we proceed to resume all card functions. If one of them returns
959  * an error then we simply return that error to the core and the
960  * card will be redetected as new. It is the responsibility of
961  * the function driver to perform further tests with the extra
962  * knowledge it has of the card to confirm the card is indeed the
963  * same as before suspending (same MAC address for network cards,
964  * etc.) and return an error otherwise.
965  */
966  for (i = 0; !err && i < host->card->sdio_funcs; i++) {
967  struct sdio_func *func = host->card->sdio_func[i];
968  if (func && sdio_func_present(func) && func->dev.driver) {
969  const struct dev_pm_ops *pmops = func->dev.driver->pm;
970  err = pmops->resume(&func->dev);
971  }
972  }
973 
974  return err;
975 }
976 
977 static int mmc_sdio_power_restore(struct mmc_host *host)
978 {
979  int ret;
980  u32 ocr;
981 
982  BUG_ON(!host);
983  BUG_ON(!host->card);
984 
985  mmc_claim_host(host);
986 
987  /*
988  * Reset the card by performing the same steps that are taken by
989  * mmc_rescan_try_freq() and mmc_attach_sdio() during a "normal" probe.
990  *
991  * sdio_reset() is technically not needed. Having just powered up the
992  * hardware, it should already be in reset state. However, some
993  * platforms (such as SD8686 on OLPC) do not instantly cut power,
994  * meaning that a reset is required when restoring power soon after
995  * powering off. It is harmless in other cases.
996  *
997  * The CMD5 reset (mmc_send_io_op_cond()), according to the SDIO spec,
998  * is not necessary for non-removable cards. However, it is required
999  * for OLPC SD8686 (which expects a [CMD5,5,3,7] init sequence), and
1000  * harmless in other situations.
1001  *
1002  * With these steps taken, mmc_select_voltage() is also required to
1003  * restore the correct voltage setting of the card.
1004  */
1005 
1006  sdio_reset(host);
1007  mmc_go_idle(host);
1008  mmc_send_if_cond(host, host->ocr_avail);
1009 
1010  ret = mmc_send_io_op_cond(host, 0, &ocr);
1011  if (ret)
1012  goto out;
1013 
1014  if (host->ocr_avail_sdio)
1015  host->ocr_avail = host->ocr_avail_sdio;
1016 
1017  host->ocr = mmc_select_voltage(host, ocr & ~0x7F);
1018  if (!host->ocr) {
1019  ret = -EINVAL;
1020  goto out;
1021  }
1022 
1023  ret = mmc_sdio_init_card(host, host->ocr, host->card,
1024  mmc_card_keep_power(host));
1025  if (!ret && host->sdio_irqs)
1026  mmc_signal_sdio_irq(host);
1027 
1028 out:
1029  mmc_release_host(host);
1030 
1031  return ret;
1032 }
1033 
1034 static const struct mmc_bus_ops mmc_sdio_ops = {
1035  .remove = mmc_sdio_remove,
1036  .detect = mmc_sdio_detect,
1037  .suspend = mmc_sdio_suspend,
1038  .resume = mmc_sdio_resume,
1039  .power_restore = mmc_sdio_power_restore,
1040  .alive = mmc_sdio_alive,
1041 };
1042 
1043 
1044 /*
1045  * Starting point for SDIO card init.
1046  */
1047 int mmc_attach_sdio(struct mmc_host *host)
1048 {
1049  int err, i, funcs;
1050  u32 ocr;
1051  struct mmc_card *card;
1052 
1053  BUG_ON(!host);
1054  WARN_ON(!host->claimed);
1055 
1056  err = mmc_send_io_op_cond(host, 0, &ocr);
1057  if (err)
1058  return err;
1059 
1060  mmc_attach_bus(host, &mmc_sdio_ops);
1061  if (host->ocr_avail_sdio)
1062  host->ocr_avail = host->ocr_avail_sdio;
1063 
1064  /*
1065  * Sanity check the voltages that the card claims to
1066  * support.
1067  */
1068  if (ocr & 0x7F) {
1069  pr_warning("%s: card claims to support voltages "
1070  "below the defined range. These will be ignored.\n",
1071  mmc_hostname(host));
1072  ocr &= ~0x7F;
1073  }
1074 
1075  host->ocr = mmc_select_voltage(host, ocr);
1076 
1077  /*
1078  * Can we support the voltage(s) of the card(s)?
1079  */
1080  if (!host->ocr) {
1081  err = -EINVAL;
1082  goto err;
1083  }
1084 
1085  /*
1086  * Detect and init the card.
1087  */
1088  err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1089  if (err) {
1090  if (err == -EAGAIN) {
1091  /*
1092  * Retry initialization with S18R set to 0.
1093  */
1094  host->ocr &= ~R4_18V_PRESENT;
1095  err = mmc_sdio_init_card(host, host->ocr, NULL, 0);
1096  }
1097  if (err)
1098  goto err;
1099  }
1100  card = host->card;
1101 
1102  /*
1103  * Enable runtime PM only if supported by host+card+board
1104  */
1105  if (host->caps & MMC_CAP_POWER_OFF_CARD) {
1106  /*
1107  * Let runtime PM core know our card is active
1108  */
1109  err = pm_runtime_set_active(&card->dev);
1110  if (err)
1111  goto remove;
1112 
1113  /*
1114  * Enable runtime PM for this card
1115  */
1116  pm_runtime_enable(&card->dev);
1117  }
1118 
1119  /*
1120  * The number of functions on the card is encoded inside
1121  * the ocr.
1122  */
1123  funcs = (ocr & 0x70000000) >> 28;
1124  card->sdio_funcs = 0;
1125 
1126  /*
1127  * Initialize (but don't add) all present functions.
1128  */
1129  for (i = 0; i < funcs; i++, card->sdio_funcs++) {
1130  err = sdio_init_func(host->card, i + 1);
1131  if (err)
1132  goto remove;
1133 
1134  /*
1135  * Enable Runtime PM for this func (if supported)
1136  */
1137  if (host->caps & MMC_CAP_POWER_OFF_CARD)
1138  pm_runtime_enable(&card->sdio_func[i]->dev);
1139  }
1140 
1141  /*
1142  * First add the card to the driver model...
1143  */
1144  mmc_release_host(host);
1145  err = mmc_add_card(host->card);
1146  if (err)
1147  goto remove_added;
1148 
1149  /*
1150  * ...then the SDIO functions.
1151  */
1152  for (i = 0;i < funcs;i++) {
1153  err = sdio_add_func(host->card->sdio_func[i]);
1154  if (err)
1155  goto remove_added;
1156  }
1157 
1158  mmc_claim_host(host);
1159  return 0;
1160 
1161 
1162 remove_added:
1163  /* Remove without lock if the device has been added. */
1164  mmc_sdio_remove(host);
1165  mmc_claim_host(host);
1166 remove:
1167  /* And with lock if it hasn't been added. */
1168  mmc_release_host(host);
1169  if (host->card)
1170  mmc_sdio_remove(host);
1171  mmc_claim_host(host);
1172 err:
1173  mmc_detach_bus(host);
1174 
1175  pr_err("%s: error %d whilst initialising SDIO card\n",
1176  mmc_hostname(host), err);
1177 
1178  return err;
1179 }
1180